RawImage -> ImageData; report errors with null

src/codecs/avif/decoder.ts

@@ -8,12 +8,9 @@ export async function decode(data: ArrayBuffer): Promise<ImageData> {
   if (!emscriptenModule) emscriptenModule = initEmscriptenModule(avif_dec, wasmUrl);
 
   const module = await emscriptenModule;
-  const rawImage = module.decode(data);
-  const result = new ImageData(
-    new Uint8ClampedArray(rawImage.buffer),
-    rawImage.width,
-    rawImage.height,
-  );
-
+  const result = module.decode(data);
+  if (!result) {
+    throw new Error('Decoding error');
+  }
   return result;
 }

src/codecs/avif/encoder.ts

@@ -11,6 +11,10 @@ export async function encode(data: ImageData, options: EncodeOptions): Promise<A
   const module = await emscriptenModule;
   const result = module.encode(data.data, data.width, data.height, options);
 
+  if (!result) {
+    throw new Error('Encoding error');
+  }
+
   // wasm can’t run on SharedArrayBuffers, so we hard-cast to ArrayBuffer.
   return result.buffer as ArrayBuffer;
 }

src/codecs/webp/decoder.ts

@@ -8,5 +8,9 @@ export async function decode(data: ArrayBuffer): Promise<ImageData> {
   if (!emscriptenModule) emscriptenModule = initEmscriptenModule(webp_dec, wasmUrl);
 
   const module = await emscriptenModule;
-  return module.decode(data);
+  const result = module.decode(data);
+  if (!result) {
+    throw new Error('Decoding error');
+  }
+  return result;
 }

src/codecs/webp/encoder.ts

@@ -10,6 +10,9 @@ export async function encode(data: ImageData, options: EncodeOptions): Promise<A
 
   const module = await emscriptenModule;
   const result = module.encode(data.data, data.width, data.height, options);
+  if (!result) {
+    throw new Error('Encoding error.');
+  }
   // wasm can’t run on SharedArrayBuffers, so we hard-cast to ArrayBuffer.
   return result.buffer as ArrayBuffer;
 }